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(Ho-Model.) 2 SheetsSheet 1.

H. ROGERS.

FURNACE GRATE- NO. 283,419. I Patented Aug. 21, 1883.

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HARRY ROGERS, OF NEW YORK, N. Y.

FU RNACE-G RATE.

srncrrrcnrron' forming part of Letters Patent No. 283,419, dated August 21, 1883.

' scribed in my Patent No. 193,897, datedAugust 7, 1877; and it consists in an improved form of gratebar, whereby warping is effectualiy obviated, and the clogging of the grate from ashes or clinkers is prevented; in improvements in the means of connecting the rocking graterbars with an actuating-lever,

, and in various details of the arrangement, all

half of my improved grate-bar.

end view of the same. Fig. 12 is an inverted as hereinafter more fully set forth.

My present improvements in furnacegrates are represented in the accompanying drawings, in which- Figure 1 is a side elevation. Fig.2 is a plan view. Fig. 3 is a section on the line as m, Fig. 1. Fig. 4 is a plan view of a portion of the connecting-bar, showing the offset-arm and screw-rod. Fig. 5 is a section on the line y Fig. 1. Fig. 6 is a section on the linezz, Fig. 1. '7 is a section on the line :0 m, Fig. 2. Fig. 8 is an elevation of a portion of the front of the furnace; Fig. 9 is a section on the line 1/ Fig. 8. Fig. 10 is an elevation of one- Fig. 11 is an view of the same. Fig. 13 is a section on the line 2: .3, Fig. 10. Fig. 14 is a section on the line as m, Fig. 10. Fig. 15 is a section on the line 3/ 3/, Fig. 14. Fig. 16 is a-view of one of the fire-bars as seen looking at the side of the grate-bar.

My improved furnace-grate consists of a series of rock-shafts or grate-bars, A A, supported parallel to each other in suitable bearings in the side frames, (3 0, each grate-bar being provided with a number of upwardly projecting circular flanges or fire-bars, c 0 cl (2, which form the fire-supporting surface. The

fire-bars c c d d are located on the shafts eccentrieally in the horizontal direction, and each series of flanges on one shaft alternates with the flanges on the neighboring shafts, the long flanges on one being placed opposite I the short flanges on the next, as represented. in the plan view, Fig. 2, so that the grate-stir cessible from the under side of the grate.

Application filed October 23, 1882. (No model.)

- face is practically continuous throughout, and without openings of sufficient area to allow the coals to pass downward. At each end the shafts are provided with journals B B, which rest loosely in the recesses e e, Fig. 1, in the upperedge of the side plates, 0 C. The side plates are supported on suitable legs, E E, Fig. l, and are connected together at each end by the bars F F. The side frames are provided at their upper edges with aflange, which ispreferably arranged to project inward, and extends the whole length of the frame, being bentdownward around the recesses c 6. At the corners the side frames are connected to the end bars by the bolts 9 g, which are provided with nuts on their lower ends, so as to be ac- The upper surfaces of the end bars are beveled inward and downward toward the: grate to prevent the accumulation of dust or other refuse, as represented at h, Fig. 7. Lugs i i are also formed on the inner surface of the end bars, in positions to correspond with the shorter curved flanges on the grate-bars. The upper surface of these lugs is also beveled inward. The side frames are extended upward to a point even with or slightly above the flresurface formed by the curved fire-bars c 0 d d by the'triangular pieces D D, which are fastened to the side frames by the bolts Z Z, Figs. 1 and I 5. Recess-es a a are formed in the side bars, D D, to receive the heads of the bolts Z, which extend downward through the flanges on the side frames, being inclosed below the latter by tubes 0 0, Figs. 1 and 5, which "serve to bring the nuts 11 on the lower ends of the rods some distance below the side frames to a pointwhere they are protected from the heat and are readily accessible, from below the grate. Provision is thus made for changing the grate bars, which is accomplished by removing the nuts from the rods Z l and taking off the side bars. D D, after which the grate-bars can be lifted up andtaken out. Except atthe recesses a n, the upper surface of the side cars is beveled inward and downward. The side bars protect the journals B B from-ashes and dirt, and prevent clinkers from forming at the ends of the grate-bars, so as to render the shaking device inoperative.

Each grateba-r A is provided with an arm, T, which projects downward and carries atits 2 reams) lower extremity a journal, 8, Figs. 3 and 6, arranged parallel with the length of the bar. The grate-bar, with its eccentricallyarranged fire-bars, journals, ribs, rocking arm, and journal, is cast in one piece. The journals 8 s of all the arms engage with openings in the connecting-bar H, being secured therein by spring cotters or pins, so that by. giving the latter a vibration lengthwise a rocking motion will be transmitted to the grate-bars A A, as indicated by the dotted lines in Fig. 1. The connecting-bar is arranged to be vibrated from the leverL by means of the threaded rod t and offset a. An arm, 1:, projects downward from the connecting-bar, and receives the journal w, Figs. 3 and 4, on the end of the offset. By

means of the arm 2;, I am enabled to increase the leverage applied to the arms r, and practically secure the benefit of longer arms than could be used otherwise without in many cases cutting out the brickwork to permit this oscillating motion. The offset enables me to place the lever L and rod t at one side of the furnace-doors. The rod 25 is screw-threaded, and engages with a threaded hole in the offset a. The end of the rod is pointed to facilitate its insertion into the opening in the offset. By this device I am enabled to rapidly and easily connect the bar H with the hand-lever, which is done from the front of the furnace by inserting the pointed threaded rod t in the nut, without getting into the ash-pit. The

rod passes through a slot in the front of the furnace. In some cases the offset a may be dispensed with, or it may be made very short; but I prefer always to use the arm 1), as the shaking or dumping of the grate is much facilitated thereby.

The lever L is pivoted to the slotted arm N,

which is fastened in the socket-plate I, at

tached to the front of the furnace. The inner end of the arm N is round and fitted to a circular opening in the socket-plate, and it is secured therein by a set-screw, w. The socket plate is fastened to the furnace-front by bolts or capscrews. By this arrangement I am enabled, in applying my improved grate to furnaces already in use, to set the lever L at any angle, as indicated by the dotted lines in Fig. 8, as may..be necessary to avoid doors, pipes, or other attachments. A

In Fig. 2, I have represented a portion of the wall of the ash pit or furnace in which my improved grate is set. I construct the frame of such a size as to leave a narrow opening, 2, all around it, between its outer sides and the inclosing-wall R, for the purpose of allowing for the expansion of the frame from heat, and to permit the passage of a current of air be tween the wall and the frame, in order to cool the latter as much as possible. 4

In Figs. 10 to 15, I have represented my improved grate-bar on a larger scale. eccentric position of the upper surfaces of the curvedv fire-bars c c d d is represented inthe end View, Fig. 11, and in the transverse sec-. tion, Fig. 14. It will be observed also that The face, so that the distance between adjacent fire-bars increases from the central vertical plane of the grate-bar outward toward the point of the fire-bar. The surfaces of the firebars will in this case be inclined toward the axis of the grate-bar in both the vertical and horizontal directions, thereby affording ample clearance between them.

The upper surface of the grate-bar A is beveled sidewise between the fire-bars, its central portion being brought up to an acute edge for the purpose of preventing ashes or clinkers from resting thereon. as they frequently did with the circular form of grate-bar shown in my previous patent. As represented in the drawings, the grate-bar is made of considerable depth relative to its width, and the depth is increased toward the middle of the bar. To prevent warping, I also provide the bar at the bottom, on each side, with the tapering curved ribs 70 7a, which increase gradually in dimensions from each end of the bar toward the center of its length, following the downward inclination given to the center of the bar. I am enabled, by giving my improved grate-bars this improved form, substantially similar to that herein shown, to secure a pattern which is easily moulded, and, as the result of many practical experiments, can be submitted to the most severe trials with confidence that it will retain its shape without warping from the ef fects of the heat of the fire above it. 7

I do not claim herein anything shown or described in my previous patent.

The improved form given to my grate-bar, as represented in the drawings, is that which I have arrived at after a long series of practical trials in the efforts which I have made to secure the best distribution of the metal consistent with the proper performance of the functions of supporting the fire, and of removing the ashes and clinker therefrom without liability to clogging or warping or twisting. The tapering ribs 76 It on the lower corners of the grate-bar, made deeper toward its middle portion, enable the bar to be made thinner than wouldotherwise be necessary, while they effectually prevent the bar from being warped by the heat of the fire. I do not claim, broadly, however, aribbed grate-bar, as I am aware thata vertically-corrugated bar provided with ribs 011 both its upper and lower corners has been shown in Patent N 0. 246,016, August 23,

1881. The beveled shape given to the opposing sides of v the fire-bars reduces the weight of the metal employed, while at the same time preventing clogging with ashes, and facilitating the molding. The increased depth given to the grate-bar toward its center makes the bar lighter, while it affords greater strength to resist warping.

' I claim- 1. The herein-described rocking grate-bar A, of a depth greater than its width and gradually decreasing in depth from the center towardits ends, provided with the eccentricallyarranged curved fire-bars c c dd, having their opposite surfaces inclined toward each other, as described, and having at its lower corners the tapering ribs 1: k, substantially as and for the purposes set forth.

2. Therocking grate-bar A, of a depth greator than its width and gradually decreasing in depth from its center toward its ends, provided with the transverse eccentrically arranged curved fire-bars c c d d, and having at its lower corners the tapering ribs k is, substantially as and for the purposes set forth.

3. The combination, with the side frames,

0 G, of the rocking grate-bars AA, provided with the curved fire-bars c c d (I, the side bars, D D, bolts 1! Z, and sleeves o o, substantially as and for the purposes set forth.

4-. The combination, with a series of rocking grate-bars, AA, provided with the eccentrically-arranged curved fire-bars c c d d and arms 1* r, of the connecting-bar H, arm '0, rod 15, and lever L, substantially as and for the purposes set forth.

5. The combination, with a series of rock ing grate-bars A A, provided with the eccentrically-arranged curved fire-bars c c d d and off-- HARRY ROGERS.

\Vitnesses:

G120. B. SELDEX, I H. G. PHILLrPs. 

